a river flowing E from the Rocky Mountains in NE New Mexico to the Arkansas River in E Oklahoma. 906 miles (1460 km) long. noun a river in the southern US, rising in NE New Mexico and flowing east to the Arkansas River in E Oklahoma. Length: 1458 km (906 miles)

the extensive region making up much of northern and central Canada underlain by Precambrian rocks that have been eroded to produce a low shieldlike profile. noun Also called Laurentian Shield, Laurentian Plateau. (in Canada) the wide area of Precambrian rock extending west from the Labrador coast to the basin of the Mackenzie and north from […]

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